<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        <title>差值语法实现</title>
        <script type="text/javascript" src="../js/vue.js"></script>
    </head>
    <body>
        <!-- 准备好一个容器-->
        <div id="root">
            姓: <input type="text" v-model="firstName">
            名: <input type="text" v-model="lastName">
            <br>
            <br>
            全名: <span>{{fullName}}</span>
        </div>
    </body>
        <script type="text/javascript">
            Vue.config.productionTip = false
            const vm = new Vue({
                el:'#root',
                data:{
                    firstName:'张',
                    lastName:'三',
                },
                computed:{ 
                    fullName(){
                       return this.firstName + '-' + this.lastName
                    }
                }
            })
        </script>
</html>